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IEC 4th year Final |ACCURATE EXAM
QUESTIONS ACCURATE AND VERIFIED
ACTUAL EXAM QUESTIONS WITH
DETAILED ANSWERS FOR
GUARANTEED PASS | ALREADY
GRADED A
The power supply to the mobile home shall be a feeder assembly consisting of not more than one listed ___-ampere mobile power-supply cord with an integrally molded or securely attached plug cap or a permanently installed feeder. Select one: a. 60 b. 100 c. 30 d. 50 e. 20
- ANSWER d. 50 Outdoor mobile home disconnecting means shall be installed so the bottom of the enclosure containing the disconnecting means is not less than ___ above finished grade or the working platform. Select one: a. 11/2 ft. b. 6 ft-7 in. c. 2 ft. d. 6 ft-6 in. e. 21/2 ft. - ANSWER c. 2 ft. Switching devices shall be located at least ___ horizontally from the inside walls of the pool. Select one: a. 18" b. 5' c. 2' d. 4' - ANSWER a. 18
All fixed metal parts that are within ___ feet horizontally of the inside walls of a permanently installed swimming pool must be bonded together. Select one: a. 10 b. 5 c. 20 d. 7 e. 8
- ANSWER b. 5 A 120-volt receptacle located at ___ feet from the inside wall of a swimming pool must be GFCI protected. Select one: a. 19 b. 15 c. 10 d. all of these - ANSWER d. all of these A wet-niche swimming pool luminaire is supplied by a 14 AWG flexible cord and protected with a 15-amp, GFCI breaker. The minimum size equipment grounding conductor required is ___ AWG. Select one: a. 10 b. 14 c. 8 d. 12 e. 16 - ANSWER b. 14 No receptacle shall ever be permitted to be installed within ___ feet of the inside walls of a pool. Select one: a. 20 b. 18 c. 6 d. 15 - ANSWER c. 6 No luminaires shall be installed in swimming pools for operation on supply circuits over ___ volts between conductors. Select one: a. 150 b. 30 c. 300 d. 50
c. 125 d. 50 e. 80
- ANSWER b. 200 For PV systems, conductor ampacities must be correct if installed in ambient temperatures exceeding ___°F. Select one: a. 83 b. 78 c. 71 d. 86 - ANSWER d. 86 A disconnecting means shall be provided for all ungrounded conductors derived from a stationary battery system with a voltage over ___ volts dc. Select one: a. 100 b. 60 c. 50 d. 30 - ANSWER b. 60 Automatic transfer switches (ATS) for emergency systems shall be electrically operated and ___ held. Select one: a. mechanically b. manually c. automatically d. pneumatically e. electrically - ANSWER a. mechanically The power supply to the mobile home shall be a feeder assembly consisting of not more than one listed ___-ampere mobile power-supply cord with an integrally molded or securely attached plug cap or a permanently installed feeder. Select one: a. 60 f. 100 g. 30 h. 50 i. 20 - ANSWER d. 50
Outdoor mobile home disconnecting means shall be installed so the bottom of the enclosure containing the disconnecting means is not less than ___ above finished grade or the working platform. Select one: a. 11/2 ft. f. 6 ft-7 in. g. 2 ft. h. 6 ft-6 in. i. 21/2 ft.
- ANSWER c. 2 ft. Switching devices shall be located at least ___ horizontally from the inside walls of the pool. Select one: a. 18" e. 5' f. 2' g. 4' - ANSWER a. 18 All fixed metal parts that are within ___ feet horizontally of the inside walls of a permanently installed swimming pool must be bonded together. Select one: a. 10 f. 5 g. 20 h. 7 i. 8 - ANSWER b. 5 A 120-volt receptacle located at ___ feet from the inside wall of a swimming pool must be GFCI protected. Select one: e. 19 f. 15 g. 10 h. all of these - ANSWER d. all of these A wet-niche swimming pool luminaire is supplied by a 14 AWG flexible cord and protected with a 15-amp, GFCI breaker. The minimum size equipment grounding conductor required is ___ AWG. Select one: a. 10 f. 14 g. 8 h. 12
f. provided with factory-installed ground-fault circuit-interrupter protection for personnel d. none of the these
- ANSWER c. provided with factory-installed ground-fault circuit-interrupter protection for personnel The maximum number of 15-amp receptacles permitted on a freestanding office partition is ___. Select one: a. 6 e. 13 f. 2 g. 10 - ANSWER b. 13 Conductors that supply one or more arc welders shall be protected by an overcurrent device rated or set at not more than ___% of the conductor ampacity. Select one: a. 70 f. 200 g. 125 h. 50 i. 80 - ANSWER b. 200 For PV systems, conductor ampacities must be correct if installed in ambient temperatures exceeding ___°F. Select one: a. 83 e. 78 f. 71 g. 86 - ANSWER d. 86 A disconnecting means shall be provided for all ungrounded conductors derived from a stationary battery system with a voltage over ___ volts dc. Select one: a. 100 e. 60 f. 50 g. 30 - ANSWER b. 60 Automatic transfer switches (ATS) for emergency systems shall be electrically operated and ___ held. Select one:
f. mechanically g. manually h. automatically i. pneumatically j. electrically
- ANSWER a. mechanically What is the maximum distance that a disconnect can be located from the operator's station for a carnival ride? Select one: a. 10 ft. b. 50 ft. c. 25 ft. d. 6 ft - ANSWER d. 6 ft. In a recreational vehicle park with electrical supply, at least ___% of the sites shall be equipped with 30-ampere, 125-volt receptacles. Select one: a. 100 b. 5 c. 70 d. 20 - ANSWER c. 70 Every recreational vehicle site with electrical supply shall be equipped with at least ___ 20 - ampere, 125-volt receptacle(s). Select one: a. one b. three c. two d. four e. none are required - ANSWER a. one The power supply cord to a mobile home must not be longer than ___ feet. Select one: a. 361/ b. 21 c. 261/ d. 20 e. 50 - ANSWER a. 36 1/
d. indicating a ground fault in a solidly grounded wye emergency system of more than 150 volts to ground and circuit protective devices rated 1,000 amperes or more e. all of these
- ANSWER e. all of these Storage batteries, other than lead-acid batteries, shall be ___. Select one: a. exposed b. approved c. identified d. listed - ANSWER d. listed For battery chemistries with ___ electrolyte, the structure that supports the battery shall be resistant to deteriorating action by the electrolyte. Select one: a. gaseous b. solid c. liquid d. corrosive - ANSWER d. corrosive A vessel that holds the plates, electrolyte, and other elements of a single unit in a battery is known as a(n) ___. Select one: a. cell b. storage battery c. electrolyte d. container - ANSWER d. container PV Modules intended for use in PV systems shall be ___ or be evaluated for the application and have a field label applied. Select one: a. listed b. identified c. suitable d. approved - ANSWER a. listed The PV system disconnecting means shall be in a location that is ___. Select one: a. readily accessible b. accessible to qualified persons only c. accessible d. accessible to qualified persons - ANSWER a. readily accessible
As it relates to the rapid shutdown of a PV system, the term array boundary is ___ inches from the array in all directions. Select one: a. 18 b. 12 c. 24 d. 6 - ANSWER b. 12 Photovoltaic systems with PV system dc circuits operating at ___ volts dc or greater between any two conductors shall be protected by a listed PV arc-fault circuit interrupter or other system components listed to provide equivalent protection. Select one: a. 80 b. 30 c. 300 d. 150 - ANSWER a. 80 A rapid shutdown switch for PV systems shall have a label located on or no more than ___ feet from the switch. Select one: a. 3 b. 6 c. 4 d. 2 - ANSWER a. 3 Overcurrent protection for interconnected electric power production source conductors connected to the supply side of the service disconnect means for a dwelling shall be located within ___ feet of the point where the electric power production source conductors are connected to the service. Select one: a. 3 b. 5 c. 2 d. 10 - ANSWER d. 10 What is the VA input of a fully-loaded, 5 hp, 230-volt, single-phase motor? Select one: a. 12, b. 746 c. 3, d. 6,440 - ANSWER d. 6, A code letter D is marked on a motor nameplate. What is its locked-rotor kVA per horsepower? Select one: a. 4.0 - 4. b. 3.55 - 3. c. 0 - 3.
a. 76.23 amps b. 86.62 amps c. 63 amps d. 69.3 amps - ANSWER d. 69.3 amps Determine the minimum size THWN copper feeder conductors required by the NEC® to supply the following 480-volt, continuous duty, 3-phase, induction-type, design B motors.* 1 - 40 hp * 1 - 50 hp * 1 - 60 hp Select one: a. 3/0 AWG b. 4/0 AWG c. 250 kcmil d. 2/0 AWG - ANSWER b. 4/0 AWG What size THHN copper transformer secondary conductors will be required to feed a 3phase, 30 hp, 480-volt motor load? The secondary conductors terminate at a fusible disconnect with 70 amp fuses. The - transformer primary is supplied by a 12,470-volt circuit protected with 10 amp fuses. Select one: a. 3 b. 10 c. 6 d. 4 e. 8 - ANSWER d. 4 A 50 hp 230-volt, 3-phase squirrel cage motor has a full-load current of ___ amps. Select one: a. 143 b. 802 c. 130 d. 114 e. 179 - ANSWER c. 130 A 14 AWG THHN copper conductor is used between a motor starter and a remote start/stop station. What is the maximum size circuit breaker permitted for the motor short-circuit ground-fault protection that will also protect the 14 AWG conductor? Select one: a. 15 amp b. 10 amp c. 45 amp d. 60 amp - ANSWER c. 45 amp Where the motor control circuit transformer rated primary current is less than 2 amperes, an overcurrent device rated or set at not more than ___% of the rated primary current shall be permitted in the primary circuit. Select one: a. 250
b. 167 c. 125 d. 300 e. 500 - ANSWER e. 500 Determine the minimum size overload protection required for a 480-volt, 3-phase, 15 hp, continuous duty motor given the following information.* Design B * temperature rise - 40ºC* service factor - 1.12 * actual nameplate rating - 18 amps Select one: a. 23.4 amps b. 22.5 amps c. 18 amps d. 20.7 amps - ANSWER d. 20.7 amps For a nonautomatically started motor, the overload protection shall be permitted to be shunted or cut out of the circuit during the starting period of the motor if the device by which the overload protection is shunted or cut out cannot be left in the starting position and if fuses or inverse time circuit breakers rated or set at not over ___ percent of the full-load current of the motor are located in the circuit so as to be operative during the starting period of the motor. Select one: a. 130 b. 140 c. 115 d. 125 e. 400 - ANSWER b. 140 Determine the maximum current setting permitted for overload protection for a motor that has a thermal protector integral with the motor, given the following information.* 71/2 hp - wound rotor type * two-phase, 4 wire, AC * 230 volts Select one: a. 32.3 amps b. 29.6 amps c. 26.6 amps d. 19 amps - ANSWER b. 29.6 amps When service-entrance conductors exceed 1100 kcmil for copper, the required grounded conductor must be sized not less than ___ percent of the area of the largest phase conductor. Select one: a. 15 b. 12. c. 19 d. 25 - ANSWER b. 12.
Where fixed multioutlet assemblies are employed, each ___ feet or fraction thereof of each separate and continuous length shall be considered as one outlet of not less than 180 volt-amperes where the connected appliances are unlikely to be used simultaneously. Select one: a. 1 b. 8 c. 10 d. 5 e. 6 - ANSWER d. 5 A single-family dwelling unit has three ovens rated at 6, 8, and 3.5 kW; a cooktop rated at 6 kW, and a broiler rated at 3.5 kW. The minimum demand factor to be calculated for the ungrounded service entrance conductors is ___. Select one: a. 18.6 kW b. 12.2 kW c. 30.1 kW d. 27.3 kW - ANSWER b. 12.2 kW The minimum number of 120-volt, 15-amp lighting branch circuits required for a dwelling that has 70 X 30 ft. of livable space is ___. Select one: a. 5 b. 3 c. 2 d. 4 - ANSWER d. 4 The demand factor for six residential clothes dryers in a multifamily dwelling unit is ___. Select one: a. 70% b. 80% c. 75% d. 60% - ANSWER c. 75% In a dwelling, the minimum feeder neutral for a 5 kVA clothes washer/dryer would be ___ kVA. Select one: a. 5 b. 4. c. 3. d. 3.5 - ANSWER d. 3. For track lighting installed in a retail store, a maximum of 2 feet of lighting track or fraction thereof shall be considered ___. Select one: a. 150 VA b. 180 VA c. 200 VA d. 100 VA - ANSWER a. 150 VA
The minimum feeder allowance for show window lighting expressed in volt-amps per linear foot shall be ___ VA. Select one: a. 300 b. 200 c. 180 d. 100 - ANSWER b. 200 Before demand factors are taken into consideration in commercial buildings, generaluse receptacle loads are to be computed at not less than ___ VA per outlet. Select one: a. 120 b. 180 c. 150 d. 100 - ANSWER b. 180 Where fixed multioutlet assemblies are employed, each ___ feet or fraction thereof of each separate and continuous length shall be considered as one outlet of not less than 180 volt-amperes where the connected appliances are likely to be used simultaneously. Select one: a. 1 b. 10 c. 6 d. 5 e. 8 - ANSWER a. 1 The NEC® requires the ampacity of a feeder shall be equal to, or greater than ___. Select one: a. the calculated load after demand factors have been applied b. 125% of the overcurrent protection device c. the connected load d. the sum of all branch circuit overcurrent protection devices - ANSWER a. the calculated load after demand factors have been applied What is the demand load for eighty receptacles located in a 15,000-square-foot office building? Select one: a. 15, b. 12, c. 180 d. 14,400 - ANSWER a. 15, For a fire alarm system, an SLC ___ allowed to be T-Tapped. Select one: a. is b. is not - ANSWER a. is A ___ is an example of a fire alarm system initiating device.
A ___ is an example of a fire alarm system notification device. Select one: a. horn strobe b. pull station - ANSWER a. horn strobe A dual-action fire alarm pull station ___. Select one: a. can only be installed on addressable systems b. requires two hand actions to operate the station c. allows for two distinct signals to occur d. all of these - ANSWER b. requires two hand actions to operate the station When installing FPL cable underground for a fire alarm system, the cable ___ when it is listed for direct burial. Select one: a. can be directly buried b. must contain an EGC when installed in PVC c. either a or b d. neither a nor b - ANSWER c. either a or b When installing a fire alarm system, survivability cable is typically used in a ___. Select one: a. restaurant b. hospital c. school d. single-story office building - ANSWER b. hospital The installation of a fire alarm system requires a plenum cable to be run above the layin ceilings. Which of the following cable types is acceptable?I. CMR II. CMP III. FPLR IV. FPLP Select one: a. III or IV only b. I, II, or III only c. II or IV only d. I or III only e. III only f. I, II, III, or IV - ANSWER c. II or IV only A fire alarm system monitors the circuit cables connected to it and causes a trouble signal when a break in the wiring is detected. For fire alarm systems, this circuit monitoring is referred to as ___. Select one: a. zoning b. protection c. conduction d. supervision - ANSWER d. supervision
Which of the following can be utilized by a conventional fire alarm system?I. Class A IDCs II. Class B IDCs III. SLCs Select one: a. III only b. I or II only c. I or II & III d. I only e. II only - ANSWER b. I or II only A(n) ___ fire alarm system groups notification devices into zones. Select one: a. conventional b. addressable c. both a and b d. neither a nor b - ANSWER a. conventional For a fire alarm system utilizing the same device layout, a(n) ___ system requires fewer total feet of cable. Select one: a. conventional b. addressable - ANSWER b. addressable When working on an existing, disabled fire alarm system, you should ___. Select one: a. test the system for proper operation before re-enabling it b. test all wiring before making any terminations at the panel c. both a and b d. neither a nor b - ANSWER c. both a and b After repairs have been made to an existing fire alarm system, you should put the system back on line ___ notifications are made. Select one: a. after b. before - ANSWER b. before Before working on an existing and active fire alarm system, you should notify the ___. Select one: a. building tenants b. building owner c. monitoring company d. all of these - ANSWER d. all of these Coaxial cable shall be permitted to deliver power to equipment that is directly associated with the radio frequency distribution system if the voltage is not over ___
